Hi,
I very new to sumps. I recently purchased a new tank that came with one so I threw myself into the deep end with that. I have only ever had HOBs so find the sump a bit scary.
Can I do a water change and just change the water in the sump and not the tank if I don't want to gravel vac?
I also packed my sump full of sponges there are no bits empty - is that overkill. I have a little bit of bio media in there in between some layers but not much. I would appreciate any advise on how best to use this sump.